Malicious PDF — malware analysis report

Static analysis result for SHA-256 15980390fffd8ac8…

MALICIOUS

PDF

79.5 KB Created: 2021-04-07 02:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea3d02675795a20ddfdef31e26d3d853 SHA-1: d8f23c1b18c80a17558d9fb1c9b023b028154a70 SHA-256: 15980390fffd8ac8e4b1b9f97d8fc03ac0ec6b9090af3ca78b2ac71e46b89e25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with one pointing to 'jumiwimov.ru' and another to a PDF hosted on 'fullstacket.online', suggesting a link farm or phishing attempt. The presence of embedded URLs and the high ML score indicate a strong likelihood of malicious intent, possibly to download further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/wix?keyword=wd+my+cloud+mirror+manual
    • http://fullstacket.online/basketball_stars_unblockedbj1u8.pdf
    • http://copyrightshelpcenter.com/343312023505jpwn.pdf
    • https://static.s123-cdn-static.com/uploads/4475564/normal_6004d1dcc8e41.pdf
    • https://tijawuxegolizad.weebly.com/uploads/1/3/4/5/134597381/27189773931eb8f.pdf
    • https://static.s123-cdn-static.com/uploads/4452157/normal_5fc7e203634c2.pdf
    • https://nisuwifa.weebly.com/uploads/1/3/1/4/131453943/wixanaxoraxa-sezulaxoxeja-tovetonep-modikoba.pdf
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/b6b50d0c.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://copyrightviolationcenters.com/riders_in_the_sky_1949zej50.pdf
    • https://vufumepuzatine.weebly.com/uploads/1/3/5/3/135335191/e08ebcc77889f98.pdf
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/c66166e.pdf
    • http://creditchecktotal.info/ascend_performance_materials_decatur_alrayyj.pdf
    • https://kaposabebozof.weebly.com/uploads/1/3/4/4/134466843/bewegenedunu.pdf
    • http://rusakova.space/950578822733v5bj.pdf
    • https://pupaxutakigi.weebly.com/uploads/1/3/4/5/134579126/xelimosamunojubu.pdf
    • http://raifaisentapp.online/15791705182pn9n5.pdf
    • http://rkconstructionsucks.com/6120430723859ugi.pdf
    • http://fasad-dom.site/cuantos_pies_cuadrados_tiene_un_metro_cuadrado_yahool9979.pdf
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/jimuzojulutux.pdf
    • https://static.s123-cdn-static.com/uploads/4456996/normal_5ffb6c4081f21.pdf
    • https://nujujuzizupefe.weebly.com/uploads/1/3/1/6/131606206/rexupi.pdf
    • https://cdn-cms.f-static.net/uploads/4370542/normal_603ea4b8531bb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_0756745316ea4e19ae813e6c2c32fcee.pdf?index=true
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_c8b55dad8d464ccfa4a634affb864dfa.pdf?index=true
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_fa18cc4d9c3048b49bc1cfacff54a00e.pdf?index=true
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_e480d6813b7e4f72a4f4ff1aec990da5.pdf?index=true
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_1c65cebd06034508a855f5c213376176.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7c.bin
9b5d627b4b6f0cd76db9686cc241f6921b87e5404f013e7f4c351c8e10d59eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 5020 bytes
font_01_sfnt_off00010c88.bin
13fc0646dc479c98fe56d3c8a7e7b3efdef383a3d841a5ffc6e435d0bd8bb3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 10624 bytes

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